Java HTTP工具類

package com.redis.sign;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.*;

/**
 *
 */
public class HttpClient {

	public static JSONObject postJson(String reqUrl, JSONObject jsonParam) throws Exception {

		DefaultHttpClient htClient = new DefaultHttpClient();

		HttpPost method = new HttpPost(reqUrl);

		StringEntity entity = new StringEntity(jsonParam.toString(), "utf-8");// 解決中文亂碼問題
		entity.setContentEncoding("UTF-8");
		entity.setContentType("application/json");
		method.setEntity(entity);
		HttpResponse result = htClient.execute(method);
		String resData = EntityUtils.toString(result.getEntity());
		JSONObject resJson = JSONObject.parseObject(resData);
		return resJson;
	}

	public static String post(String reqUrl, Map<String, String> reqParams) throws Exception {
		if (reqParams == null) {
			reqParams = new HashMap<>();
		}
		System.out.println("---------請求地址：" + reqUrl);
		System.out.println("---------請求參數：" + JSON.toJSONString(reqParams));
		CloseableHttpClient client = HttpClients.createDefault();
		HttpPost post = new HttpPost(reqUrl);
		try {
			List<NameValuePair> params = new ArrayList<NameValuePair>();
			for (String key : reqParams.keySet()) {
				params.add(new BasicNameValuePair(key, reqParams.get(key)));
			}
			UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(params, "UTF-8");
			/* 設置參數 */
			post.setEntity(urlEncodedFormEntity);
			HttpResponse response = client.execute(post);
			HttpEntity entity = response.getEntity();
			String returnMsg = EntityUtils.toString(entity, "UTF-8");
			return returnMsg;
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		} finally {
			/* 釋放鏈接 */
			post.releaseConnection();
		}
	}

	public static String get(String reqUrl, Map<String, String> reqParams) throws Exception {
		System.out.println("---------請求地址：" + reqUrl);
		System.out.println("---------請求參數：" + JSON.toJSONString(reqParams));
		return execute(reqUrl, reqParams, "GET");
	}

	public static String execute(String reqUrl, Map<String, String> reqParams, String method) throws Exception {
		return execute(reqUrl, reqParams, method, "application/x-www-form-urlencoded");
	}

	public static String execute(String reqUrl, Map<String, String> reqParams, String method, String contentType)
			throws Exception {
		String response = "";
		String invokeUrl = reqUrl;
		URL serverUrl = new URL(invokeUrl);
		HttpURLConnection conn = (HttpURLConnection) serverUrl.openConnection();

		conn.setReadTimeout(10000);
		conn.setRequestMethod(method);
		conn.setDoInput(true);
		conn.setDoOutput(true);
		conn.setUseCaches(false);

		if (reqParams != null && reqParams.size() > 0) {
			conn.setRequestProperty("Cookie", reqParams.get("Cookie") + "");
			reqParams.remove("Cookie");
		}
		conn.setRequestProperty("connection", "keep-alive");
		conn.setRequestProperty("Charsert", "UTF-8");
		conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
		conn.setRequestProperty("Content-Type", contentType);
		// 傳遞參數
		String content = getStringData(reqParams);
		byte[] bypes = content.toString().getBytes();
		conn.getOutputStream().write(bypes);
		conn.connect();

		InputStream is = conn.getInputStream();
		BufferedReader in = new BufferedReader(new InputStreamReader(is, "utf-8"));
		StringBuffer buffer = new StringBuffer();
		String line = "";
		while ((line = in.readLine()) != null) {
			buffer.append(line);
		}
		response = buffer.toString();
		conn.disconnect();
		return response;
	}

	public static String getStringData(Map<String, String> params) {
		StringBuffer content = new StringBuffer();
		List<String> keys = new ArrayList<String>(params.keySet());
		Collections.sort(keys);

		for (int i = 0; i < keys.size(); i++) {
			String key = (String) keys.get(i);
			String value = params.get(key);
			if (value != null) {
				content.append((i == 0 ? "" : "&") + key + "=" + value);
			} else {
				content.append((i == 0 ? "" : "&") + key + "=");
			}
		}
		return content.toString();
	}


}